Dear PWscf Users<br><br>Is using and setting the variable "dt" in the vc-relax calculation necessary or not ? In the forum are many different suggestions. Also, how can one determine which value of<br>the variable "max_seconds" is sufficient and safe. when one does not use the "max_seconds" the vc-relax calculation may takes huge time without changing the cell <br>
after a specific time. A comprehensive example for vc-relax calculation should be very useful.<br><br>Many Thanks<br>Masoud<br> <br>